(1989). Study on regional travel in the Philippines 1989. DOT/AIT.
Lua i Stíl Chicago (17ú heag.)Study on Regional Travel in the Philippines 1989. [Quezon City]: DOT/AIT, 1989.
Lua MLA (9ú heag.)Study on Regional Travel in the Philippines 1989. DOT/AIT, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.